JPH10211623A - Fluid pouring pin and mold for molding hollow object equipped therewith - Google Patents
Fluid pouring pin and mold for molding hollow object equipped therewithInfo
- Publication number
- JPH10211623A JPH10211623A JP1634797A JP1634797A JPH10211623A JP H10211623 A JPH10211623 A JP H10211623A JP 1634797 A JP1634797 A JP 1634797A JP 1634797 A JP1634797 A JP 1634797A JP H10211623 A JPH10211623 A JP H10211623A
- Authority
- JP
- Japan
- Prior art keywords
- fluid
- pin
- fluid injection
- mold
- hollow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1734—Nozzles therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、成形型間に供給さ
れた溶融樹脂中に流体を供給して中空成形体を製造する
ために使用される流体注入ピンおよびこれを備えた中空
体成形用金型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid injection pin used for producing a hollow molded product by supplying a fluid into a molten resin supplied between molding dies, and a hollow molding device having the same. Regarding the mold.
【０００２】[0002]
【従来の技術】従来より、成形体内部に中空部を有する
熱可塑性樹脂製中空成形体は多くの分野に使用され、そ
の製造方法として、成形型間に供給された溶融樹脂中に
圧縮空気などの流体を供給する方法がよく知られてい
る。そして、その流体の供給方法として、キャビティ内
に設けた流体供給ピンの流体供給口から流体を溶融樹脂
中に注入する方法が知られており、該注入ピンについて
もキャビティ内に固定された固定ピン方式や、キャビテ
ィ内と金型内とを移動する可動ピン方式が知られてい
る。2. Description of the Related Art Conventionally, a thermoplastic resin hollow molded article having a hollow portion inside a molded article has been used in many fields. As a method for producing the same, compressed air or the like is introduced into a molten resin supplied between molds. The method of supplying the fluid is well known. As a method of supplying the fluid, a method of injecting a fluid into a molten resin from a fluid supply port of a fluid supply pin provided in a cavity is known, and the injection pin is also fixed to a fixed pin fixed in the cavity. A method and a movable pin method for moving between a cavity and a mold are known.
【０００３】これら公知の流体供給ピンは、たとえば、
ピン内部に流体供給源と連通した中空空間を流体通路と
して有し、該流体通路とピンの先端部ないし外周表面と
を連通する貫通孔がピンの先端部ないし外周面に開口し
た構造となっており、流体は開口部である流体供給口よ
り溶融樹脂中に供給されている。しかし、このような流
体供給ピンを使用する場合には、予め金型間に供給され
た溶融樹脂が金型面や流体供給ピンなどの低温部分で固
化し、その接触面でスキン層を形成するため、流体供給
ピンの表面に開口する流体供給口がスキン層に覆われて
供給口が小さくなって低圧での流体の供給ができなくな
ったり、場合によっては供給された流体が固化したスキ
ン層を突き破ることができず、流体が溶融樹脂中に供給
できなくなってしまうという問題があった。[0003] These known fluid supply pins include, for example,
A hollow space communicating with a fluid supply source is provided inside the pin as a fluid passage, and a through-hole communicating the fluid passage with the tip or outer peripheral surface of the pin has a structure opened at the tip or outer peripheral surface of the pin. The fluid is supplied into the molten resin from a fluid supply port which is an opening. However, when using such a fluid supply pin, the molten resin previously supplied between the molds solidifies at a low temperature portion such as the mold surface or the fluid supply pin, and forms a skin layer on the contact surface. Therefore, the fluid supply port opened on the surface of the fluid supply pin is covered with the skin layer, and the supply port becomes small, so that it is not possible to supply the fluid at a low pressure. There is a problem that the fluid cannot be broken through and the fluid cannot be supplied into the molten resin.
【０００４】[0004]
【発明が解決しようとする課題】このようなことから、
本発明者らは複雑な装置や特殊な流体を用いることな
く、たとえ流体供給前にスキン層が形成されていても、
流体供給時には流体供給口を閉鎖させることなく、低圧
の流体であっても容易に流体が溶融樹脂中に供給するこ
とのできる流体供給ピンを開発すべく検討の結果、本発
明に至った。SUMMARY OF THE INVENTION
The present inventors, without the use of complex devices and special fluids, even if the skin layer is formed before the fluid supply,
As a result of studying to develop a fluid supply pin that can easily supply a low-pressure fluid into the molten resin without closing the fluid supply port during fluid supply, the present invention has been achieved.
【０００５】[0005]
【課題を解決するための手段】本発明の第１は、雌雄一
対からなる成形型間に供給された溶融樹脂中に流体を供
給して中空成形体を製造するための流体注入ピンであっ
て、その先端が封鎖された中空管からなり、該中空管の
管壁にはこれを貫通して外周面に開口する貫通孔が、ま
た、外周面には前記貫通孔の中心と同一軸線上に切り欠
き凹部が設けられ、かつ中空空間の後端開口部が流体供
給源に連通してなるとともに、該中空管が中空管の長さ
方向に進退移動可能な移動手段に接続されてなることを
特徴とする流体注入ピンであり、本発明の第２は、雌雄
一対からなる成形型間に供給された溶融樹脂中に流体を
供給して中空成形体を製造するための流体注入ピンであ
って、その先端が封鎖された中空管からなり、該中空管
の外周面には切り欠き凹部および該中空外管の管壁部を
貫通して外周面に開口する貫通孔が同一円周軸上に設け
られ、かつ中空管の後端開口部が流体供給源に連通して
なるとともに、該中空管が中空管の円周方向に回動可能
な回動手段に接続されてなることを特徴とする流体注入
ピンであり、本発明の第３は、雌雄一対からなる成形型
間に供給された溶融樹脂中に流体を供給して中空成形体
を製造するための流体注入ピンであって、その先端より
下位の外周面に切り込みを有し、後端部がその長さ方向
に移動可能な移動手段に接続されるとともに、後端部の
外周面が流体供給源と接続されてなることを特徴とする
流体注入ピンであり、また、本発明はこのような流体注
入ピンを備えた中空体成形用金型を提供するものであ
る。A first aspect of the present invention is a fluid injection pin for producing a hollow molded body by supplying a fluid into a molten resin supplied between a pair of male and female molds. A hollow tube having a closed end, a through hole passing through the hollow tube and opening to the outer peripheral surface, and the outer peripheral surface having the same axis as the center of the through hole. A notch concave portion is provided on the line, and a rear end opening of the hollow space communicates with a fluid supply source, and the hollow tube is connected to moving means capable of moving forward and backward in the longitudinal direction of the hollow tube. A second aspect of the present invention is a fluid injection pin for supplying a fluid into a molten resin supplied between a pair of male and female molds to produce a hollow molded body. A pin having a closed end and having a hollow tube cut into an outer peripheral surface of the hollow tube; The hollow and the hollow outer tube are provided with a through hole passing through the tube wall of the hollow outer tube and opening on the outer peripheral surface on the same circumferential axis, and the rear end opening of the hollow tube communicates with the fluid supply source. The fluid injection pin is characterized in that the hollow tube is connected to a rotating means rotatable in the circumferential direction of the hollow tube. A fluid injection pin for supplying a fluid into the molten resin supplied between the molds to produce a hollow molded body, having a cut in an outer peripheral surface lower than a front end thereof, and a rear end portion having the same length as the length thereof. The fluid injection pin is connected to a moving means capable of moving in the direction, and the outer peripheral surface of the rear end portion is connected to a fluid supply source. The present invention provides a hollow body molding die provided with:
【０００６】[0006]
【発明の実施の形態】以下、本発明の流体供給ピンにつ
いて説明する。本発明の第１の形態である流体注入ピン
（１）は、図１に例示されるように、その内部に設けら
れた流体通路となる長さ方向の中空空間（４）がその先
端（５）側で封鎖された中空管（６）からなり、該中空
管の管壁部を貫通して外周面（７）に開口する貫通孔
（８）が設けられ、また、該中空管の外周面の前記貫通
孔の中心と同一軸線上に切り欠き凹部（９）が設けられ
た構造となっており、かかる流体注入ピンの中空空間の
後端開口部（１０）は流体供給源（１１）に連通してな
るとともに、該中空管が中空管の長さ方向に進退移動可
能な移動手段（１２）と接続される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fluid supply pin according to the present invention will be described. As illustrated in FIG. 1, a fluid injection pin (1) according to a first embodiment of the present invention has a longitudinal hollow space (4) serving as a fluid passage provided therein, and has a distal end (5). ) Side, a through-hole (8) is provided which penetrates the tube wall of the hollow tube and opens to the outer peripheral surface (7). A cutout recess (9) is provided on the outer peripheral surface on the same axis as the center of the through hole, and the rear end opening (10) of the hollow space of the fluid injection pin is provided with a fluid supply source ( 11), and the hollow tube is connected to a moving means (12) capable of moving forward and backward in the longitudinal direction of the hollow tube.
【０００７】本発明の流体注入ピンは、中空成形体を製
造する場合に、これを雌雄一対からなる成形型のいずれ
か一方または両方の金型に設けて使用されるが、以下、
図１に示される流体注入ピンを例にとって、その使用方
法とともに、さらに詳細に説明する。図２は、流体注入
ピン（１）をその長さ方向が金型の成形面に対して垂
直、すなわち成形型の開閉方向と同一方向になるよう
に、雌雄（２，３）いずれか一方または両方の成形型
（図２においては雄金型）に設けた場合の例であって、
流体注入ピンは流体供給開始前の状態において、貫通孔
（８）が雄金型（３）の金型成形面（１３）より下方の
金型内に、切り欠き凹部（９）が貫通孔より先端側でキ
ャビティ内に位置するように取り付けられており、雌金
型（２）の流体注入ピンの対応する位置には、型締時に
おいて該流体注入ピンの先端部を収納するための該流体
注入ピンの先端部が嵌合し、摺動可能な金型凹部（１
４）が設けられている。かかる凹部（１４）の深さは流
体注入ピンにおける切り欠き凹部や貫通孔（または中空
外管貫通孔）のピン先端部からの位置や該ピンの移動距
離によっても異なって特に限定されないが、前記したよ
うな流体注入ピンをその成形前後において移動させる場
合に、該ピンの先端と相対する他の金型の金型面によっ
てその移動が妨げられない程度の深さであればよい。[0007] The fluid injection pin of the present invention is used in the case of manufacturing a hollow molded body by providing it in one or both molds of a pair of male and female molding dies.
Taking the fluid injection pin shown in FIG. 1 as an example, a more detailed description will be given together with the method of using the pin. FIG. 2 shows one of the male and female (2, 3) or the fluid injection pin (1) so that its longitudinal direction is perpendicular to the molding surface of the mold, that is, in the same direction as the opening and closing direction of the mold. This is an example in which both molds (male mold in FIG. 2) are provided.
Before starting fluid supply, the fluid injection pin has a through hole (8) in the mold below the mold forming surface (13) of the male mold (3), and a cutout recess (9) from the through hole. The fluid is provided so as to be located in the cavity on the tip side, and the fluid for accommodating the tip of the fluid injection pin at the time of mold clamping is provided at a position corresponding to the fluid injection pin of the female mold (2). The tip of the injection pin is fitted and slidable in the mold recess (1).
4) is provided. The depth of the concave portion (14) varies depending on the position of the cutout concave portion and the through hole (or hollow outer tube through hole) of the fluid injection pin from the tip of the pin and the moving distance of the pin, but is not particularly limited. When the fluid injection pin as described above is moved before and after the molding, the depth may be such that the movement is not hindered by the mold surface of another mold facing the tip of the pin.
【０００８】流体注入ピン（１）を金型に設ける位置
は、得られた中空成形体の使用目的によっては金型の最
終製品相当部であってもよいが、場合によっては金型の
非製品部に設け、成形終了後に該非製品部を切り離すこ
とにより最終製品にピン跡を生ぜしめることもなく中空
成形体を得ることができる。流体注入ピン（１）をこの
ように金型に取り付けた後、たとえば両金型を開いて金
型内に設けた樹脂通路を経由してキャビティ内に溶融樹
脂（１５）を供給し、所定のキャビティクリアランスに
なるまで金型を閉じる（型締）。溶融樹脂は流体注入ピ
ンを包み込みながらキャビティ内を流動し、金型成形面
（１３）や流体注入ピンの切り欠き凹部（９）や外周面
（７）と接触する部分は樹脂温度が低下、固化してスキ
ン層（１６）が形成される。このときの流体注入ピンの
部分を拡大して図３に示す。尚、溶融樹脂の供給にあた
っては、所定のキャビティクリアランスになるまで型締
した際に、少なくとも流体注入ピン（１）の周辺は完全
に溶融樹脂で満たされるが、溶融樹脂がキャビティ内を
完全に充填されてしまうことなく、目的とする中空成形
体の中空部分に相当する程度の空隙が金型キャビティの
溶融樹脂の流動末端部分で残存する程度にその供給量を
調節することが好ましく、また、そのために溶融樹脂の
供給ゲ−トの位置を調整することが好ましい。金型を閉
じた後、流体注入ピン（１）を、該ピンに設けた貫通孔
（８）がピンの移動前の切り欠き凹部（９）の位置にな
るように移動手段（１２）により雌金型（２）方向に突
き出して移動させる。流体注入ピンの移動により、切り
欠き凹部（９）内に入り込んでいたスキン層は該凹部内
に取り込まれたままその周辺のスキン層から削り取ら
れ、当初の切り欠き凹部が接していた部分にはスキン層
が欠落した未固化の溶融樹脂が現れる。流体注入ピンの
移動を貫通孔が当初に切り欠き凹部が位置していたとこ
ろで停止させると、貫通孔の開口部は上記のスキン層内
部の溶融樹脂と直接接することとなる。このときの流体
注入ピンの部分を拡大して図４に示す。この状態におい
て、貫通孔（８）から流体の注入を行えば、貫通孔の開
口部にはスキン層は存在せず、溶融樹脂と直接接してい
るために、数ｋｇｆ程度の低圧の流体であっても容易に
溶融樹脂（１５）中に供給することができ、流体の供給
によって中空部を形成させながら溶融樹脂をキャビティ
内に充満させ、この状態を維持しながら溶融樹脂を冷却
固化することにより中空成形体が得られる。The position where the fluid injection pin (1) is provided on the mold may be a part corresponding to the final product of the mold, depending on the purpose of use of the obtained hollow molded body. A hollow molded article can be obtained without forming pin marks on the final product by providing the non-product part after the completion of the molding. After the fluid injection pin (1) is attached to the mold in this way, for example, both molds are opened, and the molten resin (15) is supplied into the cavity via a resin passage provided in the mold. Close the mold until the cavity clearance is reached (mold clamping). The molten resin flows inside the cavity while wrapping around the fluid injection pin, and the temperature of the resin is reduced and solidified in the portion that comes into contact with the mold forming surface (13), the cutout recess (9) of the fluid injection pin and the outer peripheral surface (7). Thus, a skin layer (16) is formed. FIG. 3 is an enlarged view of the fluid injection pin at this time. When the molten resin is supplied, at least the periphery of the fluid injection pin (1) is completely filled with the molten resin when the mold is clamped to a predetermined cavity clearance, but the molten resin is completely filled in the cavity. Without being done, it is preferable to adjust the supply amount to such an extent that a void corresponding to the hollow portion of the intended hollow molded body remains at the flow end portion of the molten resin in the mold cavity, and It is preferable to adjust the position of the supply gate of the molten resin. After the mold is closed, the fluid injection pin (1) is moved by the moving means (12) so that the through hole (8) provided in the pin is located at the notch recess (9) before the pin is moved. It is protruded and moved in the direction of the mold (2). By the movement of the fluid injection pin, the skin layer that has entered the notch recess (9) is scraped off from the surrounding skin layer while being taken into the notch, and the portion where the initial notch recess was in contact is removed. An unsolidified molten resin with a missing skin layer appears. When the movement of the fluid injection pin is stopped at the position where the cutout recess is initially located in the through hole, the opening of the through hole comes into direct contact with the molten resin inside the skin layer. FIG. 4 is an enlarged view of the fluid injection pin at this time. In this state, if the fluid is injected from the through-hole (8), since the skin layer does not exist at the opening of the through-hole and is in direct contact with the molten resin, the fluid is a low-pressure fluid of about several kgf. However, the molten resin can be easily supplied into the molten resin (15), and the molten resin is filled in the cavity while forming a hollow portion by supplying a fluid, and the molten resin is cooled and solidified while maintaining this state. A hollow molded body is obtained.
【０００９】尚、流体注入ピン（１）の移動前後におい
て切り欠き凹部（９）と貫通孔（８）の位置を一致させ
るためには、該ピンに設ける切り欠き凹部と貫通孔の位
置が流体注入ピンの長さ方向において同一軸線上にある
ことが必要であり、この位置が同一軸線上にない場合に
は、流体注入ピンを長さ方向に移動させても、貫通孔の
開口部が切り欠き凹部の存在していた位置と一致せず、
貫通孔の開口部がスキン層で封鎖されて流体の注入が困
難となって、流体注入ピン自体の回動操作も同時に要求
されて操作が煩雑となる。In order to match the positions of the notch recess (9) and the through-hole (8) before and after the movement of the fluid injection pin (1), the position of the notch recess and the through-hole provided on the pin is determined by the position of the fluid. The injection pin must be on the same axis in the length direction.If this position is not on the same axis, the opening of the through hole is cut even if the fluid injection pin is moved in the length direction. It does not match the position where the notched recess existed,
The opening of the through-hole is closed by the skin layer, making it difficult to inject the fluid, and the rotation operation of the fluid injection pin itself is required at the same time, which complicates the operation.
【００１０】このような流体注入ピン（１）の形状とし
ては、通常はその外周の断面形状として円形ないしは楕
円形である場合が多いが、四角形や六角形などであって
もよく、その外観も断面形状に応じて円柱状、角柱状な
ど任意である。また、その内部の流体通路となる中空空
間（４）は、該ピンの先端側で封鎖されていることが必
要であるが、その形状自体は任意である。貫通孔（８）
や切り欠き凹部（９）を設ける位置は、成形過程におけ
るキャビティクリアランスなどによって適宜決定される
が、雌雄両金型間への溶融樹脂の供給開始時あるいは型
締開始時において、切り欠き凹部がキャビティ内に位置
し、流体注入ピンの先端（５）が他の金型に設けた金型
凹部（１４）内に挿入可能となるとともに、貫通孔が金
型の成形面より下位の金型内にあってキャビティ内に開
口しないように設けられる。The shape of the fluid injection pin (1) is usually circular or elliptical in cross section of its outer periphery in many cases. However, it may be square or hexagonal, and its appearance is also good. The shape is arbitrary such as a columnar shape or a prismatic shape according to the cross-sectional shape. Further, the hollow space (4) serving as a fluid passage inside thereof needs to be closed at the tip side of the pin, but the shape itself is arbitrary. Through hole (8)
The position at which the notch recess (9) is provided is appropriately determined by cavity clearance or the like during the molding process, but when the supply of the molten resin between the male and female molds or the start of mold clamping starts, the notch recesses (9) And the tip (5) of the fluid injection pin can be inserted into the mold recess (14) provided in another mold, and the through hole is formed in the mold lower than the molding surface of the mold. So that it does not open into the cavity.
【００１１】かかる流体注入ピン（１）は通常金属製で
あり、その具体的な寸法は材質その他種々の条件で変わ
るが、少なくとも接続される移動手段によって該ピンが
移動しえる程度の強度および流体の供給圧力に耐える強
度を有することが必要であり、例えば流体注入ピンの外
周断面および流体通路である中空空間が円形である場合
には、その外周直径は３〜１０ｍｍ程度であり、また、
中空空間の断面直径は外周直径や管壁の厚さなどに応じ
て変わるが通常０．５〜８ｍｍ程度である。また、貫通
孔（８）は、通常、該ピンの長さ方向（軸方向）に対し
て直角に設けられるが、製品形状その他成形条件によっ
ては上向きまたは下向きの角度をつけて設けられていて
もよく、また、貫通孔は必ずしもその大きさがその全て
で均一である必要もなく、中空空間側と外周面側とでそ
の大きさが異なって適宜のテーパーが設けられていても
よい。尚、貫通孔と切り欠き凹部の間隔は、流体供給開
始時に流体注入ピンを対向する金型（図では雌金型）側
に突き上げて移動させたときに、貫通孔が、移動前の切
り欠きの位置と一致するような距離であればよい。The fluid injection pin (1) is usually made of metal, and its specific dimensions vary depending on the material and other various conditions, but at least the strength and fluid of such a degree that the pin can be moved by the connected moving means. It is necessary to have a strength to withstand the supply pressure of, for example, when the outer cross section of the fluid injection pin and the hollow space that is the fluid passage are circular, the outer diameter is about 3 to 10 mm, and
The cross-sectional diameter of the hollow space varies depending on the outer diameter, the thickness of the tube wall, and the like, but is usually about 0.5 to 8 mm. The through-hole (8) is usually provided at right angles to the length direction (axial direction) of the pin, but may be provided at an upward or downward angle depending on the product shape and molding conditions. Also, the size of the through-hole does not necessarily have to be uniform in all of the holes, and the through-hole may have a different size between the hollow space side and the outer peripheral surface side, and may have an appropriate taper. The distance between the through hole and the notch recess is such that when the fluid injection pin is pushed up and moved toward the opposing mold (female mold in the figure) at the start of fluid supply, the through hole is Any distance may be used as long as it matches the position.
【００１２】また、切り欠き凹部（９）は該凹部を含む
ピン周りに形成した溶融樹脂のスキン層を流体注入ピン
（１）を移動させることにより、該切り欠き凹部で削り
取り、スキン層内部の溶融樹脂をむき出しにするための
ものであるから、その目的を達する限りにおいてその形
状は任意であって何ら制限されず、たとえば正面形状と
して円形、楕円形、三日月形、三角形、四角形等が、そ
の深さ方向からみた断面形状としては四角形、Ｖ字形、
Ｕ字形、半球形などが例示される。かかる切り欠き凹部
の正面形状の大きさは、流体注入ピンの移動によりスキ
ン層が削り取られたのちのむき出しにされた溶融樹脂中
に貫通孔より流体が供給できる程度の大きさであればよ
く、通常は貫通孔（８）の開口部と同程度かそれより少
々大きい程度で十分であって、必要以上に大きくするこ
とはその意味がないばかりか流体注入ピン自体もそれに
伴って大きくなるため好ましくない。また、その深さ
は、貫通孔の長さ、切り欠き凹部の形状や成形条件など
によっても異なり、流体注入ピンの移動によりスキン層
が削り取られて内部の溶融樹脂がむき出しにされる程度
であれば特に制限されないが、浅すぎるとスキン層の削
り取りが不十分となって溶融樹脂が露出せず、深すぎる
と溶融樹脂が伸長されてスキン層の削り取られた部分の
外観を損ねるため、通常は０．２〜２ｍｍ程度である。In addition, the cutout recess (9) is scraped off the molten resin skin layer formed around the pin including the recess by moving the fluid injection pin (1), thereby removing the skin layer inside the skin layer. Since it is for exposing the molten resin, its shape is arbitrary and is not limited at all as long as its purpose is achieved.For example, a circular shape, an elliptical shape, a crescent shape, a triangular shape, a square shape, etc. The cross-sectional shapes viewed from the depth direction are square, V-shaped,
U-shaped, hemispherical, etc. are illustrated. The size of the front shape of the notch concave portion may be any size as long as fluid can be supplied from the through hole into the exposed molten resin after the skin layer has been scraped off by movement of the fluid injection pin, Normally, it is sufficient that the opening is the same as or slightly larger than the opening of the through hole (8), and it is not meaningful to make the opening larger than necessary, and the fluid injection pin itself becomes larger accordingly. Absent. In addition, the depth varies depending on the length of the through hole, the shape of the notch concave portion, the molding conditions, and the like. The depth is such that the movement of the fluid injection pin scrapes off the skin layer and exposes the molten resin inside. It is not particularly limited, but if it is too shallow, the shaving of the skin layer will be insufficient and the molten resin will not be exposed, and if it is too deep, the molten resin will be stretched and impair the appearance of the shaved portion of the skin layer, so it is usually It is about 0.2 to 2 mm.
【００１３】貫通孔（８）の断面形状は円形、楕円形、
三角形、四角形など任意であり、切り欠き凹部（９）の
正面形状と同形ないしは類似の形状とされることが多
い。また、その大きさは供給する流体の供給圧力や供給
量、溶融樹脂の物性などの条件によっても変わるが、一
般にはその形状が円形である場合においてその直径が
０．５〜２ｍｍ程度である。The cross-sectional shape of the through hole (8) is circular, elliptical,
The shape is arbitrary, such as a triangle or a quadrangle, and is often the same or similar to the front shape of the cutout recess (9). In addition, the size varies depending on conditions such as the supply pressure and supply amount of the fluid to be supplied, the physical properties of the molten resin, and the like. Generally, when the shape is circular, the diameter is about 0.5 to 2 mm.
【００１４】かかる流体注入ピンにおいて、その内部に
設けられている流体通路となる中空空間（５）の後端開
口部（１０）は、従来より公知の流体供給ピンと同様に
任意の構造により流体供給源（１１）と接続され、通
常、その任意の箇所において流体供給の開始、停止手段
たとえばバルブが設けられていて、流体の供給開始や停
止が任意に制御できるようになっている。また、流体注
入ピンの後端部（１７）は、該ピンの長さ方向に進退可
能な移動手段（１２）に接続され、該移動手段を作動さ
せることによって流体注入ピンをキャビティ方向に押し
出したり、金型内に引き込んだりすることができる。か
かる移動手段そのものは従来より可動ピンを可動させる
際に使用されているような公知の移動手段、たとえば油
圧や空気圧を利用する方法が適用される。In such a fluid injection pin, the rear end opening (10) of the hollow space (5) serving as a fluid passage provided therein has a fluid supply pin having an arbitrary structure similarly to a conventionally known fluid supply pin. A fluid supply start / stop means, for example, a valve, is provided at an arbitrary point in connection with the source (11) so that the supply start / stop of the fluid can be arbitrarily controlled. The rear end (17) of the fluid injection pin is connected to a moving means (12) which can move in the longitudinal direction of the pin, and the fluid injection pin is pushed out in the cavity direction by operating the moving means. , Can be pulled into the mold. As the moving means itself, a known moving means conventionally used for moving the movable pin, for example, a method using hydraulic pressure or air pressure is applied.
【００１５】かかる流体注入ピン（１）の使用例として
ピンをその長さ方向が成形時における成形型の開閉方向
と同一方向になるように金型に設けた場合の例について
述べたが、他の例として図５〜図７に示すように、雌雄
（２，３）いずれか一方または両方の成形型（図におい
ては雄金型）内に、流体注入ピンを格納するためのピン
格納空間（１８）を、連通孔（Ａ）を介して雄金型の成
形面（１３）と連通するように設け、該格納空間内に、
流体注入ピン（１）をその長さ方向が成形型の成形面
（１３）と平行、すなわち成形型の開閉方向に対して直
角になるように、かつ該ピンの貫通孔（８）および切り
欠き凹部（９）を設けた外周面が格納空間の上壁面と緊
密に、摺動可能に接するとともに、貫通孔および切り欠
き凹部が連通孔（Ａ）の下端を通過可能に設けてなる金
型を使用する方法が挙げられる。もちろん、この場合に
おいても先の場合と同様に、流体注入ピンの中空空間の
後端開口部（１０）は流体供給源（１１）に連通してな
るとともに、該ピンの後端部（１７）が中空管の長さ方
向に進退移動可能な移動手段（１２）と接続されてい
る。As an example of the use of the fluid injection pin (1), an example has been described in which the pin is provided in a mold so that its length direction is the same as the opening and closing direction of the molding die during molding. As shown in FIGS. 5 to 7, as an example, a pin storage space (FIG. 5) for storing a fluid injection pin in one or both of the male and female (2, 3) molds (male mold in the figure). 18) is provided so as to communicate with the molding surface (13) of the male mold through the communication hole (A), and in the storage space,
The fluid injection pin (1) has its length direction parallel to the molding surface (13) of the mold, that is, perpendicular to the opening and closing direction of the mold, and has a through hole (8) and a notch in the pin. A mold having an outer peripheral surface provided with the concave portion (9) tightly and slidably in contact with an upper wall surface of the storage space, and a through hole and a cutout concave portion provided so as to pass through a lower end of the communication hole (A). The method used is mentioned. Of course, also in this case, as in the previous case, the rear end opening (10) of the hollow space of the fluid injection pin communicates with the fluid supply source (11) and the rear end (17) of the pin. Is connected to a moving means (12) capable of moving back and forth in the longitudinal direction of the hollow tube.
【００１６】この方法による場合、少なくとも溶融樹脂
の供給時から流体を供給するまでの間は、流体注入ピン
（１）の切り欠き凹部（９）と連通孔（Ａ）の位置が一
致し、貫通孔（８）が連通孔（Ａ）と重ならないように
することが必要である。（図５）また、金型面に設けた
連通孔（Ａ）の大きさは（深さ、断面形状、断面積な
ど）特に制限なく任意であるが、流体注入ピン（１）に
設けた切り欠き凹部（１０）と同程度ないしはそれより
大きいことが好ましい。かかる連通孔（Ａ）は、この目
的のために別途設けてもよいが、最終製品のリブやボス
の形成部分をこの目的に利用してもよい。ピン格納空間
（１８）は、該空間内でピンがその長さ方向に移動可能
な大きさであることが必要であり、また、流体注入ピン
（１）の切り欠き凹部（８）や貫通孔（８）が設けられ
ている外周面は少なくとも格納空間の上壁面と緊密に、
摺動可能に接していることが必要であるが、場合によっ
ては上下両面と緊密に、摺動可能に接していてもよい。
しかし、一般には図に示すように、格納空間の下面にピ
ン支持台（１９）を設け、該支持台上でピンを移動させ
ながら流体注入ピン（１）の金型成形面側の外周面を格
納空間の上壁面と緊密に摺動させることが多い。この場
合、格納空間の両側面が同時にピンの外周面に接してい
てもよいし、適宜の距離で離れていてもよいまた、流体
注入ピン（１）をその長さ方向に移動させるための移動
手段（１２）は格納空間（１８）内に設けてもよいし、
適宜の連動手段を用いて金型外に設けてもよく、該ピン
が移動可能であれば移動手段を設ける場所は任意であ
る。According to this method, the position of the cut-out recess (9) of the fluid injection pin (1) coincides with the position of the communication hole (A) at least from the time of supplying the molten resin to the time of supplying the fluid. It is necessary that the hole (8) does not overlap with the communication hole (A). (FIG. 5) The size of the communication hole (A) provided in the mold surface (depth, cross-sectional shape, cross-sectional area, etc.) is arbitrary without any particular limitation. It is preferable that it is approximately the same as or larger than the notched concave portion (10). Such a communication hole (A) may be separately provided for this purpose, or a portion of a final product where ribs and bosses are formed may be used for this purpose. The pin storage space (18) needs to have a size such that the pins can move in the length direction in the space, and the cutout recess (8) and the through hole of the fluid injection pin (1) are required. The outer peripheral surface provided with (8) is at least as close as possible to the upper wall surface of the storage space,
It is necessary to be in slidable contact, but in some cases, it may be in slidable contact with both upper and lower surfaces.
However, as shown in the figure, a pin support (19) is generally provided on the lower surface of the storage space, and the outer peripheral surface of the fluid injection pin (1) on the mold forming surface side is moved while moving the pin on the support. It often slides tightly against the upper wall of the storage space. In this case, both side surfaces of the storage space may be in contact with the outer peripheral surface of the pin at the same time or may be separated by an appropriate distance. Also, the movement for moving the fluid injection pin (1) in its length direction. The means (12) may be provided in the storage space (18),
The pin may be provided outside the mold by using an appropriate interlocking means, and the place where the moving means is provided is arbitrary as long as the pin is movable.
【００１７】この方法による場合には、予め連通孔
（Ａ）と流体注入ピン（１）の切り欠き凹部（９）の位
置が一致するように格納空間内の流体注入ピンを移動、
配置した後、溶融樹脂を供給、型締し、スキン層（１
６）を金型成形面や溶融樹脂と接している流体注入ピン
の切り欠き凹部に形成せしめ（図５）、その後切り欠き
凹部内に形成されていたスキン層を削り取りながら、貫
通孔（８）が移動前の切り欠き凹部の位置と一致するよ
うに流体注入ピンを移動させ（図６）、該貫通孔から流
体を溶融樹脂中に注入すれば中空部を（２２）を形成し
つつ（図７）溶融樹脂がキャビティ内に充満されて中空
成形体が得られ、流体注入ピンの移動方向が成形型の開
閉方向と同一か直角方向かの相違はあっても、その機能
は先に説明したと同じである。According to this method, the fluid injection pin in the storage space is moved in advance so that the position of the communication hole (A) matches the position of the cutout recess (9) of the fluid injection pin (1).
After disposing, supply the molten resin, clamp the mold, and make the skin layer (1
6) is formed in the cutout recess of the fluid injection pin which is in contact with the mold forming surface or the molten resin (FIG. 5). Thereafter, while the skin layer formed in the cutout recess is scraped, the through hole (8) is formed. Move the fluid injection pin so that it matches the position of the notch recess before the movement (FIG. 6), and inject the fluid into the molten resin from the through hole to form the hollow portion (22) (FIG. 6). 7) The cavity is filled with the molten resin to obtain a hollow molded body, and although the moving direction of the fluid injection pin is the same as or perpendicular to the opening and closing direction of the molding die, its function has been described above. Is the same as
【００１８】本発明の第２の態様である流体注入ピン
（２０）は、その内部に設けられた長さ方向の中空空間
がその先端側で封鎖された肉厚筒状の中空管からなり、
該中空管にはその管壁部を貫通して外周面に開口する貫
通孔が、また、該中空管の外周面の前記貫通孔の中心と
同一円周軸上に切り欠き凹部がそれぞれ設けられ、かつ
中空部の開口他端は流体供給源に連通してなるととも
に、該中空管が中空管の円周方向に回動可能な回動手段
（２１）に接続されてなる流体注入ピンである。A fluid injection pin (20) according to a second aspect of the present invention comprises a thick cylindrical hollow tube in which a longitudinal hollow space provided therein is closed at a distal end thereof. ,
The hollow tube has a through hole that penetrates through the tube wall and opens to the outer peripheral surface, and a notched concave portion on the same circumferential axis as the center of the through hole on the outer peripheral surface of the hollow tube. A fluid provided with the other end of the opening of the hollow portion communicating with a fluid supply source and the hollow tube being connected to a rotating means (21) capable of rotating in the circumferential direction of the hollow tube. It is an injection pin.
【００１９】この流体注入ピン（２０）は図８、図９に
示すように、その内部に設けられた長さ方向の中空空間
がその先端側で封鎖された中空管からなっており、該中
空管にはその管壁部を貫通して外周面に開口する貫通孔
（８）が設けられ、またその外周面の貫通孔の中心と同
一円周軸上には切り欠き凹部（９）がそれぞれ設けられ
た構造となっており、その動きが円周方向での回動であ
ること以外は先に述べた流体注入ピン（１）と機能は同
じであり、切り欠き凹部や貫通孔の大きさ、形状なども
同様であるが、流体注入ピンの外観を示す中空管それ自
体は、その外周面が格納空間（１８）の少なくとも上面
と緊密に摺動しながら回動する必要があるため、通常は
円柱状であり、これに対応して、格納空間上面の流体注
入ピン（２０）と摺動する部分は、該中空管の外周面に
応じた曲面となっている。ここで、貫通孔と切り欠き凹
部が同一円周軸上に設けられていることは重要であっ
て、これらが同一円周軸上にない場合には、その使用に
あたって、流体注入ピンの回動と同時に該ピンの長さ方
向への移動動作も同時に必要としてその操作が煩雑にな
る。また、同一円周軸上に設けられる貫通孔（８）と切
り欠き凹部（９）の間隔は、切り欠き凹部を成形面の開
放部に対応して配置したときに、貫通孔が同時に開放部
と対応することがなければ任意であるが、一般には両者
は９０度ないしは１８０度の間隔をもって設けられる。As shown in FIGS. 8 and 9, the fluid injection pin (20) is formed of a hollow tube in which a longitudinal hollow space provided therein is closed at the distal end side. The hollow tube is provided with a through hole (8) penetrating the tube wall and opening to the outer peripheral surface, and a notched concave portion (9) on the same circumferential axis as the center of the through hole on the outer peripheral surface. The functions are the same as those of the fluid injection pin (1) described above except that the movement is a rotation in the circumferential direction. The same applies to the size, shape, etc., but the hollow tube itself showing the appearance of the fluid injection pin needs to rotate while its outer peripheral surface closely slides at least on the upper surface of the storage space (18). Therefore, it is usually cylindrical, and correspondingly, the fluid injection pin (20) on the upper surface of the storage space is Portion motion has a curved surface corresponding to the outer peripheral surface of the hollow tube. Here, it is important that the through-hole and the cutout recess are provided on the same circumferential axis. If they are not on the same circumferential axis, the rotation of the fluid injection pin is required for use. At the same time, a moving operation in the length direction of the pin is required at the same time, and the operation becomes complicated. The distance between the through hole (8) and the notch recess (9) provided on the same circumferential axis is such that when the notch recess is arranged corresponding to the opening of the molding surface, the through hole is simultaneously opened. Although they are optional unless they correspond to each other, they are generally provided at an interval of 90 degrees or 180 degrees.
【００２０】このような流体注入ピン（２０）を用いて
中空成形体を製造する場合、雌雄いずれか一方または両
方の成形型（図８、図９では雄型）の型内には流体注入
ピン（３０）を設置するための、先に述べたと同様のピ
ン格納空間（１８）が設けられ、該格納空間の連通孔
（Ａ）が開口している上面と流体注入ピンの外周面が緊
密に回動可能に、かつ、流体注入ピンの貫通孔および切
り欠き凹部が連通孔の位置に対応するように設けられて
なる金型が使用される。When a hollow molded body is manufactured using such a fluid injection pin (20), a fluid injection pin is provided in one or both of the male and female molds (the male mold in FIGS. 8 and 9). A pin storage space (18) similar to that described above is provided for installing the (30), and the upper surface of the storage space where the communication hole (A) is open and the outer peripheral surface of the fluid injection pin are tightly closed. A mold is used that is rotatably provided with a through hole and a cutout recess of the fluid injection pin corresponding to the position of the communication hole.
【００２１】かかる金型を使用して中空成形体を製造す
るには、雌雄両金型間に溶融樹脂を供給する前に、連通
孔（Ａ）の位置に切り欠き凹部（９）がくるように流体
注入ピン（２０）を回動させて配置した後、前記したよ
うに溶融樹脂の供給、型締を行い、その後連通孔（Ａ）
の位置に貫通孔（８）がくるように流体注入ピン（２
０）を回動させて、貫通孔より流体を溶融樹脂中に供給
する。この方法による場合には、溶融樹脂を供給し、型
締すると、金型面および連通孔を介して接している流体
注入ピンの切り欠き凹部を含む外周面で溶融樹脂が冷
却、固化されてその表面にスキン層を形成する（図８）
が、その後に連通孔（Ａ）の位置に貫通孔（８）がくる
ように流体注入ピンを回動させることにより、切り欠き
凹部面に形成されていたスキン層が流体注入ピンの回動
に伴なって削り取られ、未固化の溶融樹脂と貫通孔が直
接接することになり（図９）、貫通孔から溶融樹脂中に
流体を容易に供給することができる。In order to manufacture a hollow molded article using such a mold, a cutout recess (9) should be formed at the position of the communication hole (A) before the molten resin is supplied between the male and female molds. After the fluid injection pin (20) is rotated and arranged, the supply of the molten resin and the mold clamping are performed as described above, and then the communication hole (A)
Fluid injection pin (2) so that through hole (8) comes
0) is rotated to supply a fluid into the molten resin from the through hole. In the case of this method, the molten resin is supplied, and when the mold is clamped, the molten resin is cooled and solidified on the outer peripheral surface including the cutout concave portion of the fluid injection pin in contact with the mold surface and the communication hole, and the molten resin is solidified. Form a skin layer on the surface (Fig. 8)
Then, by rotating the fluid injection pin so that the through hole (8) comes to the position of the communication hole (A), the skin layer formed on the cutout concave surface is rotated by the fluid injection pin. Accordingly, the unsolidified molten resin is directly in contact with the through-hole (FIG. 9), and the fluid can be easily supplied from the through-hole into the molten resin.
【００２２】本発明の第３の態様である流体注入ピン
（３０）は、図１０、図１１に示すように、流体の供給
をピン外周部から行うものであって、その先端より下位
の外周面に切り込み凹部を有し、後端部がその長さ方向
に移動可能な移動手段に接続されるとともに、後端部の
外周面が流体供給源と接続された構造となっている。As shown in FIGS. 10 and 11, a fluid injection pin (30) according to a third embodiment of the present invention supplies a fluid from an outer peripheral portion of the pin, and has an outer peripheral portion lower than the distal end thereof. The surface has a cut-out recess, and the rear end is connected to moving means that can move in the longitudinal direction, and the outer peripheral surface of the rear end is connected to a fluid supply source.
【００２３】この流体注入ピン（３０）は、ピン外周面
（７）に切り欠き凹部（９）を設け、切り欠き凹部によ
ってスキン層を削り取るという機能は先に述べた流体注
入ピン（１、２０）と同じであるが、ピンそれ自体に流
体を供給するための機能は有しておらず、該ピンの外周
面と該ピンを格納する格納装置（３１）に設けたピン摺
動壁との間の隙間を流体流路として利用するものであ
る。このため、流体注入ピン（３０）は、該ピンとこれ
を格納する格納装置を組み合わせて使用される。The fluid injection pin (30) has a cutout recess (9) on the outer peripheral surface (7) of the pin, and the function of scraping the skin layer by the cutout recess is as described above. ), But does not have a function of supplying fluid to the pin itself, and is provided between the outer peripheral surface of the pin and the pin sliding wall provided in the storage device (31) for storing the pin. The gap between them is used as a fluid flow path. For this reason, the fluid injection pin (30) is used in combination with the pin and a storage device for storing the pin.
【００２４】ここで、流体注入ピン（３０）の基本的形
状は、太さが均一で、その断面形状が円形、四角形など
任意の形状からなる棒状体であり、その先端部も場合に
よっては円錐状、角錐状のように先端部のみが細くなっ
ていてもよいが、通常は平面形状である。切り欠き凹部
（９）の形状、大きさなどは前記したと同様であり、切
り欠き凹部（９）を設ける位置もピン先端から下位であ
れば特に制限はないが、ピン先端からの距離が長くなれ
ば、ピン自体の長さも長くなるため、僅かに下位である
程度で十分であり、通常はピン先端から切り欠き凹部の
先端までが０．５〜５ｍｍ程度である。尚、この場合の
切り欠き凹部（９）は一個所である必要はなく、同一円
周上に複数個設けてもよく、場合によっては連続した溝
状であってもよい。Here, the basic shape of the fluid injection pin (30) is a rod-like body having a uniform thickness and a cross-sectional shape of any shape such as a circle or a square, and the tip of the fluid injection pin (30) may be a cone in some cases. Although only the tip portion may be thin like a shape or a pyramid, it is usually a flat shape. The shape and size of the notch recess (9) are the same as described above, and the position of the notch recess (9) is not particularly limited as long as it is lower than the pin tip, but the distance from the pin tip is long. If this is the case, the length of the pin itself will also be long, so that it is sufficient for the pin to be slightly lower to some extent. Usually, the distance from the tip of the pin to the tip of the cutout recess is about 0.5 to 5 mm. In this case, the notch concave portion (9) does not need to be at one place, and may be provided in plural on the same circumference, or may be a continuous groove shape in some cases.
【００２５】格納装置（３１）は、流体注入ピン（３
０）を収納し、かつ該ピンをその長さ方向に摺動させる
ためのピン摺動孔（３２）を有し、該摺動孔（３１）は
流体通路を介して流体供給源（１１）と接続されてお
り、流体注入ピン（３０）をその長さ方向に移動させる
ための移動手段（１２）はこの装置外であってもよい
し、装置内に設けられていてもよい。（図では装置内に
移動手段を設けた例を示している） 摺動孔（３１）の長さ（深さ）は、流体注入ピンをその
先端（５）が格納装置の外周面と同一になるようような
長さであればよく、ことさらに長く深くする必要はな
い。摺動孔（３１）の形状は、流体注入ピン（３０）の
外周面が摺動孔側壁と摺動可能であればよいが、流体注
入ピンの外周面と摺動孔側壁殿の隙間は流体通路として
も利用するため、僅かに隙間が生じる程度が好ましい。
流体供給源（１１）と連通する流体通路（３３）は、こ
の摺動孔の任意の位置で連通しておればよい。The storage device (31) is provided with a fluid injection pin (3).
0) and has a pin sliding hole (32) for sliding the pin in the length direction thereof, and the sliding hole (31) is provided through a fluid passage through a fluid supply source (11). The moving means (12) for moving the fluid injection pin (30) in the longitudinal direction thereof may be provided outside the apparatus or may be provided inside the apparatus. (The figure shows an example in which the moving means is provided in the apparatus.) The length (depth) of the sliding hole (31) is such that the tip of the fluid injection pin (5) is the same as the outer peripheral surface of the storage device. It is only necessary that the length be as long as possible, and it is not necessary to make it even longer and deeper. The shape of the slide hole (31) may be any shape as long as the outer peripheral surface of the fluid injection pin (30) can slide on the slide hole side wall. Since it is also used as a passage, it is preferable that a slight gap is formed.
The fluid passage (33) communicating with the fluid supply source (11) may be in communication with an arbitrary position of the sliding hole.
【００２６】次に、図１０、図１１に基づいてかかる流
体注入ピン（３０）を用いて中空成形体を製造する例に
ついて述べる。この例では、先に述べたと同様のピン格
納空間（１８）を雄金型（３）内に設け、ピン摺動孔
（３２）が金型成形面に設けた連通孔（Ａ）の位置と一
致し、かつ格納装置（３１）の上端面と格納空間の上端
面とが密接に接触するように格納装置を配置し、流体注
入ピン（３０）はその後端部に設けた移動手段（１２）
により、摺動孔（３２）を介して連通孔（Ａ）内に進退
自由に移動できるようになっている。この方法により中
空成形体を製造する場合には、溶融樹脂の供給を開始す
る前に予め流体注入ピン（３０）に設けた切り欠き凹部
が連通孔（Ａ）に位置するように該ピンを成形面側に突
き出しておく。このとき、切り欠き凹部の位置は、該凹
部が完全に連通孔（Ａ）内に入り込む程度でよく、連通
孔（Ａ）内の奥深くまで突き出す必要はない。その後溶
融樹脂の供給型締を行えば、先の例と同様に切り欠き凹
部を含むピン外周面や金型面に接する表面部分で溶融樹
脂が冷却固化され、スキン層が形成される。（図１０） その後、流体注入ピン（３０）をその先端（５）がピン
格納装置（３１）の上端面と同じ位置になるまで降下さ
せると、切り欠き凹部（９）内に形成されていたスキン
層はその周辺のスキン層から削り取られて切り欠き凹部
内に取り込まれ、ピン先端部分は未固化の溶融樹脂と直
接接する状態となる。（図１１） この状態で、摺動孔（３２）に連通する流体通路から流
体を供給すると、流体は流体注入ピン（３０）の外周面
と摺動孔（３２）の内周面との隙間から連通孔（Ａ）内
に入り込み、キャビティ内の溶融樹脂はこの流体によっ
て中空部を形成しながらキャビティ内に充満される。そ
の後、溶融樹脂を冷却固化すれば、その内部に中空部を
形成せしめた中空成形体が得られる。Next, an example of manufacturing a hollow molded body using the fluid injection pin (30) will be described with reference to FIGS. In this example, the same pin storage space (18) as described above is provided in the male mold (3), and the pin sliding hole (32) is located at the position of the communication hole (A) provided on the mold molding surface. The storage device is arranged such that the upper end surface of the storage device (31) and the upper end surface of the storage space are in close contact with each other, and the fluid injection pin (30) is provided at the rear end of the moving means (12).
Thereby, it is possible to freely move into and out of the communication hole (A) via the sliding hole (32). When manufacturing a hollow molded body by this method, before starting the supply of the molten resin, the pin is formed so that the cutout recess provided in the fluid injection pin (30) is positioned in the communication hole (A). Stick out on the surface side. At this time, the position of the cut-out recess may be such that the recess completely enters the communication hole (A), and it is not necessary to protrude deep into the communication hole (A). Thereafter, when the supply of the molten resin is clamped, the molten resin is cooled and solidified on the outer peripheral surface of the pin including the notched concave portion and the surface portion in contact with the mold surface, as in the previous example, to form a skin layer. (FIG. 10) Thereafter, when the fluid injection pin (30) was lowered until its tip (5) was at the same position as the upper end surface of the pin storage device (31), the fluid injection pin (30) was formed in the cutout recess (9). The skin layer is scraped off from the surrounding skin layer and is taken into the notch recess, so that the pin tip comes into direct contact with the unsolidified molten resin. (FIG. 11) In this state, when the fluid is supplied from the fluid passage communicating with the sliding hole (32), the fluid flows into the gap between the outer peripheral surface of the fluid injection pin (30) and the inner peripheral surface of the sliding hole (32). Through the communication hole (A), and the molten resin in the cavity is filled with the fluid while forming a hollow portion. Thereafter, if the molten resin is cooled and solidified, a hollow molded body having a hollow portion formed therein is obtained.
【００２７】以上述べたような流体注入ピンを備えた金
型を用いて成形することにより、スキン層などの固化層
に遮られることなく、１０ｋｇｆ／cm2 以下程度の低圧
の流体も溶融樹脂中に容易に注入することができる。か
かる目的で使用される流体は気体であっても液体であっ
てもよく、従来より中空成形体を製造する場合に使用さ
れる流体であれば特に制限されることなく使用可能であ
るが、通常は空気、窒素、ヘリウム炭酸ガスなどの気体
が使用される。By molding using a mold having a fluid injection pin as described above, a low-pressure fluid of about 10 kgf / cm 2 or less can be formed in the molten resin without being blocked by a solidified layer such as a skin layer. Can be easily injected. The fluid used for such a purpose may be a gas or a liquid, and any fluid conventionally used for producing a hollow molded article can be used without any particular limitation, but is usually used. A gas such as air, nitrogen, or helium carbon dioxide is used.
【００２８】尚、以上の説明においては、開放状態の金
型間に溶融樹脂を供給する方法について述べたが、成形
方法としては何らこのような方法に限定されず、前記し
たような流体注入ピンの機能を利用する限りにおいて、
閉鎖された金型間に所定量の溶融樹脂を射出供給する射
出成形法などにも同様に適用することができ、射出成形
法による場合には、上記の説明における溶融樹脂供給後
の型締を行う必要はない。In the above description, the method of supplying the molten resin between the molds in the open state has been described. However, the molding method is not limited to such a method. As long as you use the functions of
The same can be applied to an injection molding method or the like in which a predetermined amount of molten resin is injected between closed molds. In the case of the injection molding method, the mold clamping after the supply of the molten resin in the above description is performed. No need to do.
【００２９】また、成形型間に予め表皮材を供給後、上
記と同様の方法を実施することにより、表皮材をその表
面に貼合した中空成形体を製造することもできる。かか
る表皮材としては、目的とする中空成形体の表面加飾、
クッション性の付与、断熱性の付与などの各目的に応じ
て適宜選択されるが、溶融樹脂の熱可塑性樹脂によって
溶融あるいは破れなどが生じないことが必要である。こ
のような表皮材としては、例えば紙、織布、不織布、熱
可塑性樹脂や熱可塑性エラストマーからなるシ−トもし
くはフィルム、各種発泡シ−トなどの単独あるいはこれ
らの組み合わせからなる積層体が使用され、これら表皮
材の表面にはシボ等の凹凸模様や印刷が施されていても
よい。表皮材の厚みは材質によっても異なるが、通常
０．５〜４ｍｍ程度である。Further, after supplying the skin material between the molding dies in advance, the same method as described above can be carried out to produce a hollow molded body having the skin material bonded to the surface thereof. As such a skin material, surface decoration of the target hollow molded body,
It is appropriately selected according to each purpose, such as imparting cushioning property and imparting heat insulating property. However, it is necessary that the thermoplastic resin of the molten resin does not cause melting or breakage. As such a skin material, for example, a laminate made of paper, woven fabric, nonwoven fabric, a sheet or film made of a thermoplastic resin or a thermoplastic elastomer, various foamed sheets alone or a combination thereof is used. The surface of these skin materials may be provided with an uneven pattern such as a grain or printing. The thickness of the skin material varies depending on the material, but is usually about 0.5 to 4 mm.
【００３０】また、かかる流体注入ピンを用いて熱可塑
性樹脂製中空成形体を製造するにあたり、適用される樹
脂としては従来より使用されている樹脂がそのまま適用
されて何ら制限はなく、たとえばポリエチレンやポリプ
ロピレンなどのポリオレフィン系樹脂、ポリスチレン、
スチレン・アクリロニトリル共重合体、アクリロニトリ
ル・スチレン・ブタジエン共重合体、ポリ塩化ビニル、
ポリアミド、ポリカーボネート、ポリエチレンテレフタ
レート、ポリブチレンテレフタレート、ポリフェニレン
エーテルなどの一般的な熱可塑性樹脂、熱可塑性エラス
トマー、これらの混合物あるいはこれらを用いたポリマ
ーアロイなどが例示される。これらの樹脂は必要に応じ
てタルク、ガラス繊維、ワラストナイトなどの充填材を
含有していてもよく、もちろん、通常使用される酸化防
止剤、紫外線防止剤などの各種の添加剤が含有されてい
てもよい。In producing a hollow molded article made of a thermoplastic resin using such a fluid injection pin, a conventionally used resin is applied as it is without any limitation. Polyolefin resin such as polypropylene, polystyrene,
Styrene-acrylonitrile copolymer, acrylonitrile-styrene-butadiene copolymer, polyvinyl chloride,
Examples include general thermoplastic resins such as polyamide, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, and polyphenylene ether, thermoplastic elastomers, mixtures thereof, and polymer alloys using these. These resins may contain fillers such as talc, glass fiber, wollastonite and the like, if necessary, and, of course, contain various additives such as antioxidants and ultraviolet rays commonly used. May be.
【００３１】[0031]
【発明の効果】本発明の流体注入ピンおよびこのような
ピンを備えた金型を使用することにより、複雑な装置や
特殊な流体を用いることなく、たとえ流体供給前にスキ
ン層が形成されていても、流体供給時には流体供給口を
閉鎖させることなく、低圧の流体であっても容易に流体
を溶融樹脂中に供給することができ、中空成形体を容易
に製造することができる。By using the fluid injection pin of the present invention and the mold having such a pin, a skin layer can be formed without a complicated device or a special fluid, even before the fluid is supplied. Even when the fluid is supplied, the fluid can be easily supplied into the molten resin even if the fluid is low-pressure without closing the fluid supply port, and the hollow molded body can be easily manufactured.
【００３２】[0032]
【実施例】以下、本発明を実施例で説明するが、本発明
がこの実施例に限定されるものでないことは言うまでも
ない。EXAMPLES Hereinafter, the present invention will be described with reference to Examples, but it goes without saying that the present invention is not limited to these Examples.
【００３３】実施例１ 図５に示される金型（金型成形面の平面概略図を図１２
に示す。）を使用し、平板部厚さ３ｍｍ、リブ幅８ｍ
ｍ、リブ高さ１０ｍｍで、リブ部に中空を有する図１３
に示される形状の中空成形体を製造した。尚、図５には
図示されていないが、この金型には図１２に示されるよ
うに、キャビティ内の一端には射出機に接続された溶融
樹脂供給口が設けられている。先ず、金型の成形面下部
の格納空間内に設けた流体注入ピンを移動させて、切り
欠き凹部を連通孔の位置と一致させ、金型を閉じる。次
いで、溶融樹脂供給口から溶融状態のポリプロピレン樹
脂（住友ノ−ブレンＡＸ５６８、住友化学社製）をキャ
ビティ内に供給する。このときの溶融樹脂の供給量はキ
ャビティ容積の９０％とした（図５）。所定量の溶融樹
脂の供給完了１秒後に流体注入ピンの貫通孔が連通孔の
位置に一致するように流体供給ピンを移動させ（図
６）、同時に貫通孔から８ｋｇｆ／ｃｍ2 の圧縮空気の
吐出を開始し、中空部を形成させながら溶融樹脂をキャ
ビティ内に充満させた（図７）。圧縮空気の圧力を保持
したまま熱可塑性樹脂を５０秒間冷却して、固化させた
後、金型を開放し、図１３に示す外観の中空成形体を得
た。得られた成形体のリブ部には長手方向に中空部が形
成されており、圧縮気体の供給中も貫通孔の詰まりは全
く生じなかった。Example 1 FIG. 12 is a schematic plan view of a mold (mold forming surface) shown in FIG.
Shown in ), Flat plate thickness 3mm, rib width 8m
m, rib height 10 mm, hollow part in rib part FIG. 13
Was manufactured. Although not shown in FIG. 5, this mold is provided with a molten resin supply port connected to an injection machine at one end in the cavity as shown in FIG. First, the fluid injection pin provided in the storage space below the molding surface of the mold is moved so that the cut-out recess matches the position of the communication hole, and the mold is closed. Next, a molten polypropylene resin (Sumitomo Noblen AX568, manufactured by Sumitomo Chemical Co., Ltd.) is supplied from the molten resin supply port into the cavity. At this time, the supply amount of the molten resin was set to 90% of the cavity volume (FIG. 5). One second after the completion of the supply of the predetermined amount of the molten resin, the fluid supply pin is moved so that the through hole of the fluid injection pin coincides with the position of the communication hole (FIG. 6), and at the same time, compressed air of 8 kgf / cm @ 2 is discharged from the through hole. And the cavity was filled with the molten resin while forming a hollow portion (FIG. 7). After cooling and solidifying the thermoplastic resin for 50 seconds while maintaining the pressure of the compressed air, the mold was opened to obtain a hollow molded body having the appearance shown in FIG. A hollow portion was formed in the longitudinal direction of the rib portion of the obtained molded body, and no clogging of the through-hole occurred even during the supply of the compressed gas.
【００３４】実施例２ 流体注入ピンが図８、図９に示されるような回動式であ
る金型を使用する以外は実施例１と同様にして図１３に
示す外観の中空成形体を得た。得られた中空成形体のリ
ブ端は、流体注入ピンの外周形状に対応して若干Ｒ形状
となっていたが、リブ部には長手方向に中空部が形成さ
れており、圧縮気体の供給中も貫通孔の詰まりは全く生
じなかった。Example 2 A hollow molded article having the appearance shown in FIG. 13 was obtained in the same manner as in Example 1 except that a fluid injection pin used was a rotary mold as shown in FIGS. Was. The end of the rib of the obtained hollow molded article was slightly rounded in correspondence with the outer peripheral shape of the fluid injection pin, but a hollow portion was formed in the rib portion in the longitudinal direction, so that the compressed gas was being supplied. Also, no clogging of the through holes occurred.
【００３５】実施例３ 図１０、図１１に示されるような流体注入ピンの外周面
と摺動孔の内周面との間隙を利用して流体を供給する流
体供給ピンを備えた金型を使用する以外は実施例１と同
様にして図１３に示す外観の中空成形体を得ることがで
きる。Embodiment 3 A mold having a fluid supply pin for supplying a fluid by using a gap between the outer peripheral surface of the fluid injection pin and the inner peripheral surface of the sliding hole as shown in FIGS. A hollow molded article having the appearance shown in FIG. 13 can be obtained in the same manner as in Example 1 except that it is used.
【００３６】実施例４ 図１４に示されるような箱型形状であって、その中央部
に２本の中空リブを有する形状の中空部成形体を製造す
るための金型形状を有し、キャビティ端部に流体注入ピ
ンを設けた図２に示す金型を使用して、中空成形体を製
造した。尚、この金型における中央の２本のリブ部に対
応する溝寸法は、幅８ｍｍ、深さ１５ｍｍであり、製品
端部には取り付け穴を形成させるための貫通ピンがそれ
ぞれの溝の両端側に合計４本設けられており、そのうち
の一方の側の２本を流体注入ピンと兼ねた。この流体注
入ピンは図１に示すよう形状であって、直径８ｍｍの肉
厚円筒からなり、その表面には幅２ｍｍ、深さ１ｍｍの
三日月型の切り欠き凹部が設けられており、この凹部と
同一軸線上であってそれより下位の位置に円筒内の中空
空間（流体通路）と連通する直径１ｍｍの流体注入用の
断面が円形の貫通孔が設けられている。両金型を開放
し、貫通孔が金型成形面より下の金型内にあり、切り欠
き凹部がキャビティ内に位置するように流体注入ピンを
突き出す。雌金型を降下させ、キャビティクリアランス
が１０ｍｍになったところで降下を停止し、実施例１で
用いたと同じ溶融状ポリプロピレン樹脂の供給を開始す
る。溶融樹脂の供給完了と同時に雌金型の降下を再開し
て溶融樹脂をキャビティ内に流動させながら型締を行
い、キャビティクリアランスが３ｍｍになったところで
型締を完了し、その後２０Ｔの型締力を保持する。この
時、流体注入ピンの周辺は溶融樹脂で充満されている
が、キャビティ内には溶融樹脂は完全に充満されておら
ず、充填率は約９０容量％である。このときの流体注入
ピンの周辺の様子を図３に示す。型締完了直後に、貫通
孔の位置が最初の切り欠き凹部の位置になるように流体
注入ピンを上方に突き出し（このときの流体注入ピンの
周辺の様子を図４に示す）、同時に貫通孔から８ｋｇｆ
／ｃｍ2 の圧縮空気の吐出を開始し、中空部を形成させ
ながら溶融樹脂をキャビティ内に充満させた。この状態
を３０秒間保持し、熱可塑性樹脂を冷却して、固化させ
た後、流体注入ピンを下方に引き下げて金型内に収納
し、両金型を開放して図１４に示す外観の中空成形体を
得た。得られた成形体は、流体注入ピンの貫通孔周辺と
それに繋がるリブ部の長手方向に中空部が形成されてお
り、圧縮気体の供給中も貫通孔の詰まりは全く生じなか
った。また、流体の供給を製品の取り付け部より行った
ために、製品面にはピン穴もなく、外観も良好であっ
た。Example 4 A cavity having a box shape as shown in FIG. 14 and a mold shape for producing a hollow molded body having two hollow ribs at the center thereof is provided. Using the mold shown in FIG. 2 having a fluid injection pin at the end, a hollow molded body was manufactured. The groove dimensions corresponding to the two central ribs in this mold are 8 mm in width and 15 mm in depth, and through-pins for forming mounting holes are formed at both ends of each groove at the end of the product. , And two of them on one side also served as a fluid injection pin. The fluid injection pin has a shape as shown in FIG. 1 and is formed of a thick cylinder having a diameter of 8 mm, and a crescent-shaped notch recess having a width of 2 mm and a depth of 1 mm is provided on the surface thereof. A 1 mm-diameter through-hole for injecting a fluid with a diameter of 1 mm, which is in communication with a hollow space (fluid passage) in the cylinder, is provided at a lower position on the same axis line. Both molds are opened and the fluid injection pin is protruded so that the through hole is in the mold below the mold molding surface and the notch recess is located in the cavity. The female mold is lowered, and when the cavity clearance becomes 10 mm, the lowering is stopped, and the supply of the same molten polypropylene resin as used in Example 1 is started. Simultaneously with the completion of the supply of the molten resin, the lowering of the female mold is resumed, and the mold is clamped while the molten resin is flowing into the cavity. When the cavity clearance becomes 3 mm, the mold clamping is completed, and then the mold clamping force of 20T Hold. At this time, the periphery of the fluid injection pin is filled with the molten resin, but the cavity is not completely filled with the molten resin, and the filling rate is about 90% by volume. FIG. 3 shows a state around the fluid injection pin at this time. Immediately after the completion of the mold clamping, the fluid injection pin is protruded upward so that the position of the through hole becomes the position of the first notch concave portion (a state around the fluid injection pin at this time is shown in FIG. 4). From 8kgf
The discharge of compressed air of / cm 2 was started, and the cavity was filled with the molten resin while forming a hollow portion. This state is held for 30 seconds to cool and solidify the thermoplastic resin. Then, the fluid injection pin is pulled down and housed in the mold, and both molds are opened to open the hollow having the appearance shown in FIG. A molded article was obtained. In the obtained molded body, a hollow portion was formed around the through hole of the fluid injection pin and in the longitudinal direction of the rib portion connected to the through hole, and no clogging of the through hole occurred even during the supply of the compressed gas. Further, since the fluid was supplied from the mounting portion of the product, there was no pin hole on the product surface and the appearance was good.
【図１】本発明の流体注入ピンのピン部分を断面概略図
で示す。FIG. 1 is a schematic sectional view showing a pin portion of a fluid injection pin of the present invention.
【図２】本発明の流体注入ピンを設けた金型の断面該略
図である。FIG. 2 is a schematic cross-sectional view of a mold provided with a fluid injection pin of the present invention.
【図３】図１で示す本発明の流体注入ピンの使用時にお
ける状態を示す概念図である。FIG. 3 is a conceptual diagram showing a state when the fluid injection pin of the present invention shown in FIG. 1 is used.
【図４】図１で示す本発明の流体注入ピンの使用時にお
ける状態を示す概念図である。FIG. 4 is a conceptual diagram showing a state when the fluid injection pin of the present invention shown in FIG. 1 is used.
【図５】本発明の流体注入ピンを備えた金型の使用時に
おける状態を示す概念図である。FIG. 5 is a conceptual diagram showing a state when a mold having the fluid injection pin of the present invention is used.
【図６】本発明の流体注入ピンを備えた金型の使用時に
おける状態を示す概念図である。FIG. 6 is a conceptual diagram showing a state when a mold having the fluid injection pin of the present invention is used.
【図７】本発明の流体注入ピンを備えた金型の使用時に
おける状態を示す概念図である。FIG. 7 is a conceptual diagram showing a state when a mold having a fluid injection pin of the present invention is used.
【図８】本発明の流体注入ピンを備えた金型の使用時に
おける状態を示す概念図である。FIG. 8 is a conceptual diagram showing a state when a mold having the fluid injection pin of the present invention is used.
【図９】本発明の流体注入ピンを備えた金型の使用時に
おける状態を示す概念図である。FIG. 9 is a conceptual diagram showing a state when a mold having the fluid injection pin of the present invention is used.
【図１０】本発明の流体注入ピンを備えた金型の使用時
における状態を示す概念図である。FIG. 10 is a conceptual diagram showing a state when a mold having the fluid injection pin of the present invention is used.
【図１１】本発明の流体注入ピンを備えた金型の使用時
における状態を示す概念図である。FIG. 11 is a conceptual diagram showing a state when a mold having the fluid injection pin of the present invention is used.
【図１２】実施例１で使用した金型のキャビティ面の平
面図である。FIG. 12 is a plan view of a cavity surface of a mold used in Example 1.
【図１３】実施例１で得た成形体を示すものである。FIG. 13 shows a molded article obtained in Example 1.
【図１４】実施例４で得た成形体の上面図およびその側
面断面図である。14A and 14B are a top view and a side sectional view of a molded product obtained in Example 4.
１：流体注入ピン ２：雌金型 ３：雄金型 ４：中空空間 ５：流体注入ピン先端 ６：中空管 ７：流体注入ピン外周面 ８：貫通孔 ９：切り欠き凹部 １０：中空空間後端開口部 １１：流体供給源 １２：移動手段 １３：金型成形面 １４：金型凹部 １５：溶融樹脂 １６：スキン層 １７：注入ピン後端部 １８：ピン格納空間 １９：ピン支持台 ２０：流体注入ピン ２１：回動手段 ２２：中空部 ３０：流体注入ピン ３１：ピン格納装置 ３２：ピン摺動孔 ３３：流体通路 ３４：溶融樹脂供給口 ３５：貫通ピン Ａ：貫通孔 1: fluid injection pin 2: female mold 3: male mold 4: hollow space 5: tip of fluid injection pin 6: hollow tube 7: outer peripheral surface of fluid injection pin 8: through hole 9: cutout recess 10: hollow space Rear end opening 11: Fluid supply source 12: Moving means 13: Mold forming surface 14: Mold concave portion 15: Molten resin 16: Skin layer 17: Injection pin rear end 18: Pin storage space 19: Pin support 20 : Fluid injection pin 21: rotating means 22: hollow part 30: fluid injection pin 31: pin storage device 32: pin sliding hole 33: fluid passage 34: molten resin supply port 35: penetration pin A: penetration hole
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ // Ｂ２９Ｋ 101:12 Ｂ２９Ｌ 22:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI // B29K 101: 12 B29L 22:00
Claims (7)
融樹脂中に流体を供給して中空成形体を製造するための
流体注入ピンであって、その先端が封鎖された中空管か
らなり、該中空管の管壁にはこれを貫通して外周面に開
口する貫通孔が、また、外周面には前記貫通孔の中心と
同一軸線上に切り欠き凹部が設けられ、かつ中空空間の
後端開口部が流体供給源に連通してなるとともに、該中
空管が中空管の長さ方向に進退移動可能な移動手段に接
続されてなることを特徴とする流体注入ピン。1. A fluid injection pin for supplying a fluid into a molten resin supplied between a pair of male and female molds to produce a hollow molded body, the tip of which is formed by a closed hollow tube. A through hole is formed in the tube wall of the hollow tube so as to penetrate the tube and open to the outer peripheral surface, and a cutout recess is provided in the outer peripheral surface on the same axis as the center of the through hole, and the hollow tube is hollow. A fluid injection pin, wherein a rear end opening of the space communicates with a fluid supply source, and the hollow tube is connected to a moving means capable of moving forward and backward in the longitudinal direction of the hollow tube.
られた請求項１に記載の流体注入ピン。2. The fluid injection pin according to claim 1, wherein the notch recess is provided on a tip side of the through hole.
融樹脂中に流体を供給して中空成形体を製造するための
流体注入ピンであって、その先端が封鎖された中空管か
らなり、該中空管の外周面には切り欠き凹部および該中
空外管の管壁部を貫通して外周面に開口する貫通孔が同
一円周軸上に設けられ、かつ中空管の後端開口部が流体
供給源に連通してなるとともに、該中空管が中空管の円
周方向に回動可能な回動手段に接続されてなることを特
徴とする流体注入ピン。3. A fluid injection pin for producing a hollow molded article by supplying a fluid into a molten resin supplied between a pair of male and female molds, the tip of which is formed by a closed hollow tube. A cutout recess and a through hole passing through the tube wall of the hollow outer tube and opening to the outer circumferential surface are provided on the same circumferential axis on the outer peripheral surface of the hollow tube, and A fluid injection pin, wherein the end opening communicates with a fluid supply source, and the hollow tube is connected to a rotating means rotatable in a circumferential direction of the hollow tube.
融樹脂中に流体を供給して中空成形体を製造するための
流体注入ピンであって、その先端より下位の外周面に切
り込みを有し、後端部がその長さ方向に移動可能な移動
手段に接続されるとともに、後端部の外周面が流体供給
源と接続されてなることを特徴とする流体注入ピン。4. A fluid injection pin for supplying a fluid into a molten resin supplied between a pair of male and female molds to produce a hollow molded body, wherein a cut is made in an outer peripheral surface below a tip of the pin. A fluid injection pin having a rear end connected to a moving means movable in a longitudinal direction thereof, and an outer peripheral surface of the rear end connected to a fluid supply source.
供給して中空成形体を製造するための雌雄一対からなる
中空成形体製造用金型であって、雌雄いずれか一方また
は両方の成形型に、請求項１または２に記載の流体注入
ピンを、該流体注入ピンの先端部が成形面側に、後端部
が成形型内になるように、該ピンの長さ方向が成形型の
開閉方向と同一方向になるように配置し、必要に応じて
他の成形型の該流体注入ピンに対応する位置に、該流体
注入ピンの先端部が嵌合し、摺動可能な凹部を設けてな
ることを特徴とする中空体成形用金型。5. A mold for producing a hollow molded body comprising a pair of male and female for producing a hollow molded body by supplying a fluid into the molten resin supplied between the molding dies, wherein one or both of the male and female are formed. The length direction of the fluid injection pin according to claim 1 or 2 is set so that the front end of the fluid injection pin is on the molding surface side and the rear end is inside the molding die. It is arranged so as to be in the same direction as the opening and closing direction of the molding die, and if necessary, the tip of the fluid injection pin is fitted at a position corresponding to the fluid injection pin of another molding die, and is slidable. A mold for forming a hollow body, comprising a concave portion.
供給して中空成形体を製造するための雌雄一対からなる
中空成形体製造用金型であって、雌雄いずれか一方また
は両方の成形型の型内に、流体注入ピンを設置するため
の格納空間が、連通孔を介して成形面と連通するように
設けられ、請求項３に記載の流体注入ピンの貫通孔を設
けた外周面が格納空間の少なくとも上面と該ピンの長さ
方向に緊密に摺動可能に、かつ、流体注入ピンの貫通孔
が該開放部の位置に対応可能に、成形型の開閉方向に対
して直角方向に設けられてなることを特徴とする中空体
成形用金型。6. A mold for producing a hollow molded body comprising a pair of male and female for producing a hollow molded body by supplying a fluid into the molten resin supplied between the molding dies, wherein one or both of the male and female are formed. A storage space for installing the fluid injection pin is provided in the mold of the above-mentioned mold so as to communicate with the molding surface through the communication hole, and the through hole of the fluid injection pin according to claim 3 is provided. The outer peripheral surface can be slid tightly at least in the longitudinal direction of the pin with at least the upper surface of the storage space, and the through hole of the fluid injection pin can correspond to the position of the open portion, with respect to the opening and closing direction of the mold. A mold for forming a hollow body, which is provided at right angles.
供給して中空成形体を製造するための雌雄一対からなる
中空成形体製造用金型であって、雌雄いずれか一方また
は両方の成形型の型内に、流体注入ピンを設置するため
の格納空間が、連通孔を介して成形面と連通するように
設けられ、請求項４に記載の流体注入ピンの外周面が格
納空間の少なくとも上面と該ピンの円周方向に緊密に回
動可能に、かつ、流体注入ピンの貫通孔が該連通孔の位
置に対応可能に、成形型の開閉方向に対して直角方向に
設けられてなることを特徴とする中空体成形用金型。7. A mold for producing a hollow molded article comprising a pair of male and female for supplying a fluid into the molten resin supplied between the molding dies to produce a hollow molded article, wherein one or both of the male and female molds are provided. A storage space for installing the fluid injection pin is provided in the mold of the above-mentioned mold so as to communicate with the molding surface through a communication hole, and the outer peripheral surface of the fluid injection pin according to claim 4 is a storage space. At least in the direction perpendicular to the opening and closing direction of the molding die so as to be rotatable tightly at least in the circumferential direction of the pin and the pin, and so that the through hole of the fluid injection pin can correspond to the position of the communication hole. A mold for molding a hollow body, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1634797A JP3707182B2 (en) | 1997-01-30 | 1997-01-30 | Fluid injection pin and hollow body molding die provided with the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1634797A JP3707182B2 (en) | 1997-01-30 | 1997-01-30 | Fluid injection pin and hollow body molding die provided with the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10211623A true JPH10211623A (en) | 1998-08-11 |
| JP3707182B2 JP3707182B2 (en) | 2005-10-19 |
Family
ID=11913852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1634797A Expired - Fee Related JP3707182B2 (en) | 1997-01-30 | 1997-01-30 | Fluid injection pin and hollow body molding die provided with the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3707182B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002036377A (en) * | 2000-07-27 | 2002-02-05 | Sumitomo Chem Co Ltd | Method for manufacturing fiber-reinforced thermoplastic resin expansion molding |
| KR101379382B1 (en) * | 2013-04-19 | 2014-04-01 | 구인모 | Water injector for injection molding |
-
1997
- 1997-01-30 JP JP1634797A patent/JP3707182B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002036377A (en) * | 2000-07-27 | 2002-02-05 | Sumitomo Chem Co Ltd | Method for manufacturing fiber-reinforced thermoplastic resin expansion molding |
| KR101379382B1 (en) * | 2013-04-19 | 2014-04-01 | 구인모 | Water injector for injection molding |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3707182B2 (en) | 2005-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5665285A (en) | Method for producing a molded foam article with an integral skin | |
| EP0495614B1 (en) | Method of injection molding a thermoplastic resin and a mold for injection molding | |
| EP0825007B1 (en) | Mold assembly for making multilayer molded article and method of making multilayer molded article using the same | |
| KR100382259B1 (en) | Method for producing thermoplastic resin molded article and mold assembly therefor | |
| JPH01196318A (en) | Fluid assisting type injection molding method and system for manufacturing hollow body | |
| EP0900640B1 (en) | Process for producing hollow resin molded article | |
| WO1995026262A1 (en) | Method of manufacturing multi-layered moldings | |
| JP3707182B2 (en) | Fluid injection pin and hollow body molding die provided with the same | |
| JPH09220731A (en) | Production of thermoplastic resin molded object having hollow part | |
| JP2002337183A (en) | Method for molding three-layered laminate and molding die | |
| JPH06182862A (en) | Device for molding foamed body with skin | |
| JP3994754B2 (en) | Composite mold manufacturing mold | |
| JP2777686B2 (en) | Molding method of skinned foam | |
| JP3858453B2 (en) | Method for producing thermoplastic resin molded body having hollow portion | |
| JP2021053943A (en) | Method and apparatus for producing foamed resin molded article | |
| JP3635838B2 (en) | Mold for manufacturing thermoplastic resin hollow moldings | |
| JPH0139328B2 (en) | ||
| JP3751227B2 (en) | Mold equipment | |
| JP3938433B2 (en) | Instrument panel manufacturing method | |
| JPH07124984A (en) | Preparation of injection-molded article and nozzle used for it | |
| KR19990006697A (en) | Method for producing hollow thermoplastic occasional molded body | |
| JP2008006788A (en) | Surface-modification injection mold for thermoplastic resin | |
| JPH0655563A (en) | Manufacture for hollow molded body | |
| JP3974962B2 (en) | Insert molding equipment | |
| JPH1142667A (en) | Manufacture of thermoplastic resin hollow molding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20050420 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20050426 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20050614 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20050712 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20050725 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080812 Year of fee payment: 3 |
|
| RD05 | Notification of revocation of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: R3D05 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090812 Year of fee payment: 4 |
|
| LAPS | Cancellation because of no payment of annual fees |